Snort mailing list archives
Re: How to setup inline
From: Eric Hines <eric.hines () appliedwatch com>
Date: Sun, 09 Apr 2006 19:42:56 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Mike, What is your throughput? If you are pushing more than 200M I would say recompile your kernel with pf_ring 3 (which will give you a large ring buffer) and put a large amount of more RAM in there for it -- I'd say 4GB of memory if you can. Here is a snippit regarding some stuff on pf_ring http://www.ntop.org/PF_RING.html - ---------- snip ------------ Who needs PF_RING? Basically everyone who has to handle many packets per second. The term 'many' changes according to the hardware you use for traffic analysis. It can range from 20k pkt/sec on a i486, to 500k pkt/sec on a Pentium IV. PF_RING not only enables you to capture packets faster, it also captures packets more efficiently preserving CPU cycles. Just to give you some figures you can see how fast nProbe, a NetFlow v5/v9 probe, can go using PF_RING. - ---------- snip ------------ - ---------- snip ------------ "I did this test a year ago with 3.0 vs philwood vs vanilla libpcap. And my results were similar. My app has been logging packet capture results for almost a year on sensors capturing traffic in excess of 200 megabits/sec. vanilla libpcap taps out at about 55 megabits/sec. philwood went up to about 80 - 120 megabits/sec depending on the traffic. My goal was less than 5% packet loss - pf_ring 3.0 over the last year on all sensors lost less than .1 % per sensor!" - ---------- snip ------------ Best Regards, Eric Hines, GCIA, CISSP CEO, President Applied Watch Technologies, LLC - --------------------------------------------- Eric Hines, GCIA, CISSP CEO, President Applied Watch Technologies, LLC 1095 Pingree Road Suite 213 Crystal Lake, IL 60014 Toll Free: (877) 262-7593 ext:327 Direct: (847) 854-2725 ext:327 Fax: (847) 854-5106 Web: http://www.appliedwatch.com Email: eric.hines () appliedwatch com - -------------------------------------------- "Enterprise Open Source Security Management" Mike Montgomery wrote:
What would the hardware requirements be on a system to run inline for snort? Will be using it at the headend of a WISP, with currently approx 850 customers. I have a AMD Sempron +1800 with 1gb ram and 2 80gb hdds setup in Raid0. Will that be sufficient to handle the load? Mike Eric Hines wrote: Mike, Answer 1) Yes, you will want (3) NICs on your box. Pop a new NIC in there. When you bridge it, you will have br0 for example, which will comprise a bridge of eth1 and eth2. Make eth0 your management interface and give it an IP. eth0: 192.168.0.1 eth1: 0.0.0.0 eth2. 0.0.0.0 Answer 2) Snort-Inline uses netfilter, ipqueue, etc for dropping packets. Their are numerous writeups on how to set this up. Answer 3) Specifying which attacks are dropped is done using the drop, sdrop, etc. keywords in the action of the individual signature. I hope this helps. Best Regards, Eric Hines, GCIA, CISSP CEO, President Applied Watch Technologies, LLC --------------------------------------------- Eric Hines, GCIA, CISSP CEO, President Applied Watch Technologies, LLC 1095 Pingree Road Suite 213 Crystal Lake, IL 60014 Toll Free: (877) 262-7593 ext:327 Direct: (847) 854-2725 ext:327 Fax: (847) 854-5106 Web: http://www.appliedwatch.com Email: eric.hines () appliedwatch com -------------------------------------------- "Enterprise Open Source Security Management" Mike Montgomery wrote:Hello, I recently setup a box running snort at our headend, its not inline as of now, but its using a monitor port on a cisco 2950. What would be the ideal setup to put the box inline? I currently have 2 nics in this box, 1 on the monitor port, 2nd is the nic I use to connect to the box for console. To go inline, would I need 3 nics total, 1 in, 1 out, and set them to be bridged? Or what. If I wanted snort to drop the packets for say P2P, would snort do that by itself, or would I need to have a firewall running to do that. Just trying to make some sense of this. Thanks Mike Montgomery Citizens Communications Corp. /Systems Administrator/ ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
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Current thread:
- How to setup inline Mike Montgomery (Apr 07)
- Re: How to setup inline Eric Hines (Apr 07)
- Re: How to setup inline Mike Montgomery (Apr 09)
- Re: How to setup inline Will Metcalf (Apr 09)
- Re: How to setup inline Eric Hines (Apr 09)
- Re: How to setup inline Mike Montgomery (Apr 09)
- Re: How to setup inline Mike Montgomery (Apr 09)
- Re: How to setup inline Eric Hines (Apr 09)
- Re: How to setup inline Mike Montgomery (Apr 09)
- Re: How to setup inline Will Metcalf (Apr 10)
- Re: How to setup inline Eric Hines (Apr 07)